<template>
  <div>
    <h3>分类参数</h3>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 :closable="false"(是否展示“X”号) show-icon(显示图标) -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类 ：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
        <el-col></el-col>
      </el-row>

      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 将标签页改为many -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            size="mini"
            type="primary"
            :disabled="isButtonDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环生成的el-tag -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            size="mini"
            type="primary"
            :disabled="isButtonDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环生成的el-tag -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数或属性对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数或属性对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //分类列表
      cateList: [],
      //用户在级联下拉菜单中选中的分类id
      selectedCateKeys: [],
      //配置级联菜单中数据如何展示
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      //tab页签激活显示的页签项
      activeName: 'many',
      //用来保存动态参数数据
      manyTableData: [],
      //用来保存静态属性数据
      onlyTableData: [],
      //控制添加参数.属性对话框的显示或隐藏
      addDialogVisible: false,
      //控制添加参数.属性对话框的显示或隐藏
      addDialogVisible: false,
      //控制修改参数.属性对话框的显示或隐藏
      editDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //修改参数的表单数据对象
      editForm: {
        attr_name: ''
      },
      //添加表单验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //修改表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类数据失败')
      }
      //将数据列表赋值给cateList
      this.cateList = res.data
      // //保存总数据条数
      // this.total = res.data.total
      //   console.log(res.data);
    },
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    async handleChange() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
       //如果用户选择的不是三级分类
      if(this.selectedCateKeys.length !== 3){
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //证明选中的是三级分类
      console.log(this.selectedCateKeys)
      //发送请求，根据用户选择的三级分类和面板获取参数数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表数据失败')
      }
      console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //添加一个bool值控制文本框的显示或者隐藏
        item.inputVisible = false
        //添加一个文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        //获取的是动态参数
        this.manyTableData = res.data
      } else if (this.activeName === 'only') {
        //获取的是静态属性
        this.onlyTableData = res.data
      }
    },
    // 对话框关闭清空表单内容
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮, 添加参数
    addParams() {
      //当用户点击对话框中的确定时，校验表单
      this.$refs.addFormRef.validate(async valid => {
        //校验不通过，return
        if (!valid) return
        //校验通过，发送请求完成添加参数或者属性
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
            attr_vals: 'a,b,c'
          }
        )
        console.log(res)
        // if (res.meta.status !== 201) {
        //   return this.$message.error('添加' + this.titleText + '数据失败!')
        // }
        this.$message.success('添加' + this.titleText + '数据成功!')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮, 展示修改的对话框
    async showEditDialog(attr_id) {
      //发起请求获取需要修改的那个参数数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数数据失败')
      }
      this.editForm = res.data
      //显示修改参数.属性对话框
      this.editDialogVisible = true
    },
    editDialogClosed() {
      //当关闭修改参数.属性对话框时
      this.$refs.editFormRef.resetFields()
    },
    editParams() {
      //验证表单
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        //发送请求完成修改
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数数据失败')
        }
        this.$message.success('修改' + this.titleText + '数据成功')
        this.editDialogVisible = false
        this.handleChange()
      })
    },
    //根据id删除对应的参数或属性
    async removeParams(attr_id) {
      //弹窗提示用户是否要删除
      const confirmResult = await this.$confirm(
        '请问是否要删除该' + this.titleText,
        '删除提示',
        {
          confirmButtonText: '确认删除',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      //如果用户点击确认，则confirmResult 为'confirm'
      //如果用户点击取消, 则confirmResult获取的就是catch的错误消息'cancel'
      if (confirmResult != 'confirm') {
        return this.$message.info('已经取消删除')
      }

      //没有取消就是要删除，发送请求完成删除
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数数据失败')
      }
      this.$message.success('删除' + this.titleText + '数据成功')
      this.handleChange()
    },
    //最后对应文本框的事件和按钮的事件添加处理函数
    async handleInputConfirm(row) {
      //当用户在文本框中按下enter键或者焦点离开时都会触发执行
      //判断用户在文本框中输入的内容是否合法
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果用户输入了真实合法的数据，需要保存起来
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求, 保存这次操作
      this.saveAttrValues(row)
    },
    // 将对 attr_vals 操作, 保存到数据库
    async saveAttrValues(row) {
      // 发起请求, 保存这次操作
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败!')
      }
      this.$message.success('修改参数项成功!')
    },
    //用户点击添加按钮时触发, 展示文本输入框, 并自动获取焦点
    showInput(row) {
      row.inputVisible = true
      //$nextTick:在页面上元素被重新渲染之后，调用回调函数的代码
      this.$nextTick(_ => {
        //让文本框自动获得焦点
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(index,row){
      //删除对应索引的参数可选项
      row.attr_vals.splice(index,1)
      //调用函数，完成保存可选项的操作
      this.saveAttrValues(row)
},
  },
  // 计算属性
  computed: {
    //添加计算属性用来获取按钮禁用与否
    isButtonDisabled() {
      return this.selectedCateKeys.length !== 3
    },
    //获取选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[this.selectedCateKeys.length - 1]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}

.input-new-tag {
  width: 240px;
}
</style>